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Continue Reading for Rotair Compressor Maintenance Instructions
Table of Contents
- Service Intervals
- Compressor Oil & Filter
- Engine Oil & Filter
- Fuel Filter
- Compressor Air Filter
- Engine Air Filter
- Air Oil Separator Filter
1. Service Intervals
Service intervals for the 185CFM, 300CFM, and 425CFM Rotair compressors are the same. Please refer to your user manual for complete instructions and more details.
Replacement Period | |||
First 50 Hours | Every 500 Hours | Every 2000 Hours | |
Compressor Oil | X | X | |
Compressor Oil Filter | X | X | |
Engine Oil | X | X | |
Engine Oil Filter | X | X | |
Fuel Filter | X | X | |
1st Stage Compressor Air Filter | X | ||
2nd Stage Compressor Air Filter | X | ||
1st Stage Engine Air Filter | X | ||
2nd Stage Engine Air Filter | X | ||
Air Oil Separator Filter | X |
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A maintenance kit includes all the necessary oil filters, fuel filters, and air filters needed for your particular maintenance interval.
2. Compressor Oil & Filter
Compressor Oil Change Schedule
Change oil and filter after the first 50 hours, and then every 500 hours after that. Oil change intervals must never exceed 1,500 hours of work.
Take into consideration the working conditions in which the machine operates (dusty conditions, very high temperature, etc can require more frequent oil changes)
Compressor Oil Type
Recommended: Purchase AirLube™ Portable Compressor Oil here.
Compressor oil should be AW-46 Compressor Oil (AW = All Weather), such as Rotair Airlube (recommended) or Shell Corena 46. Keep in mind that compressor oil is different than engine oil.
Compressor Oil Capacity
D185T4F (185 CFM) |
D300T4F (300 CFM) |
D425T4F (425 CFM) |
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Compressor Oil Capacity | 2.4 gallons | 4.5 gallons | 5.3 gallons |
Compressor Oil Filters
The compressor oil and the compressor oil filter must be replaced in conjunction.
D185T4F (185 CFM) |
D300T4F (300 CFM) |
D425T4F (425 CFM) |
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Compressor User Manuals
Refer to your compressor user manual for additional details.
D185T4F User Manual (185CFM)
D300T4F User Manual (300CFM)
D425T4F User Manual (425CFM)
How-To Guide
Compressor Oil Change Procedures
3. Engine Oil & Filter
Engine Oil Change Schedule
Change oil and filter after the first 50 hours, and then every 500 hours after that.
Engine Oil Type
Viscosity must be appropriate to the ambient temperature to which the engine is to be exposed.
Kohler Engine: Recommended Oil | |||||
Viscosity | SAE |
10W-30 |
5W-30 (-30°C ÷ +30°C) |
5W-40 (-30°C ÷ +45°C) |
LOW S.A.P.S. |
With Specifications | API | CJ-4 | |||
ACEA | E6 - E7 - E9 |
Cummins Engine: Recommended Oil
The Cummins user manual recommends the following: "Use a high-quality 5W-40 heavy-duty engine oil, such as Valvoline Premium Blue Extreme or its equivalent." (page 260)

Cummins Engineering Standard (CES) Classifications | American Petroleum Institute (API) Classification | Association des Constructeurs Européen d'Automobiles (ACEA) Classification |
CES-20081 | API CJ-4 | ACEA E-9 |
Engine Oil Capacity
D185T4F (185 CFM) |
D300T4F (300 CFM) |
D425T4F (425 CFM) |
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Engine Oil Capacity | 8.9 quarts (2.2 gallons) |
11.5 quarts (2.8 gallons) |
14.8 quarts (3.7 gallons) |
Engine Oil Filters
The engine oil and the engine oil filter must be replaced in conjunction.
D185T4F (185 CFM) |
D300T4F (300 CFM) |
D425T4F (425 CFM) |
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Engine User Manuals
Kohler KDI 1903 TCR (Inside Rotair D185T4F)
Kohler KDI 2504 TCR (Inside Rotair D300T4F)
Cummins QSF3.8 CM2350 F107 (Inside Rotair D425T4f)
How-To Guide
4. Fuel Filter
Fuel Filter Change Schedule
Change fuel filter after the first 50 hours, and then every 500 hours after that, or as needed.
Fuel Filters
Kohler KDI 1903 TCR | Kohler KDI 2504 TCR | Cummins QSF3.8 CM2350 F107 | |
185 CFM Compressors | 300 CFM Compressors | 425 CFM Compressors | |
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Fuel Filter | Fuel Filter | Fuel Pre-Filter | Fuel Filter |
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5. Compressor Air Filter
Compressor Air Filter Change Schedule
- Check and clean air filters every 100 hours. May need to be checked more often, up to a daily basis, depending on the environment the machine runs in.
- They can be cleaned several times with compressed air, but never with water.
- Replace every 500 hours.
Compressor Air Filters
D185T4F (185 CFM) |
D300T4F (300 CFM) |
D425T4F (425 CFM) |
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1st Stage Compressor Air Filter | ![]() |
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2nd Stage Compressor Air Filter | ![]() |
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6. Engine Air Filter
Engine Air Filter Change Schedule
- Check and clean air filters every 100 hours. May need to be checked more often, up to a daily basis, depending on the environment the machine runs in.
- They can be cleaned several times with compressed air, but never with water.
- Replace every 500 hours.
Engine Air Filters
Kohler KDI 1903 TCR | Kohler KDI 2504 TCR | Cummins QSF3.8 CM2350 F107 | |
185 CFM Compressors | 300 CFM Compressors | 425 CFM Compressors | |
1st Stage Engine Air Filter | ![]() |
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2nd Stage Engine Air Filter | ![]() |
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7. Air Oil Separator Filter
Air Oil Separator Filter Change Schedule
- Replace after 2000 hours, depending on conditions.
Air Oil Separator Filters
D185T4F (185 CFM) |
D300T4F (300 CFM) |
D425T4F (425 CFM) |
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Remember, buying a maintenance kit gives you all the necessary filters needed for your particular maintenance interval.